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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23ad0e9cab8318871a3f46fa64a069424dd5c3b7fd48ca9d4e6b149369e6b3cd' 
  AND token = 'N8voI/fX+1wNRt2vfG9BNzTZYq4EVpJooiOBoGPCAe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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