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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bedd4285d6bb16ebb4fd9c547c4a4074fa7aa2d80b499593d97f9216b944ed5f' 
  AND token = 'RTmzTCTzK3AqJMRuKKoVqO9F43edlEqKjnZRtJxqoaQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}