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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e637da8ee24ed81c15252514a268d7742a7749e0de0512c40ba23d77d6fe9ee2' 
  AND token = '3A+P8XDTUnQITZZSm7yuSQvFvXuBb7CDqpo6Jnr3IGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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