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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bff6595757fab40dab1c7138a0dee950f18be0ec0a6b63455f9adb7103e981f0' 
  AND token = 'dIAEOX0xV2alm0ZG1FEUbEZCrb5coP0kU6eYkrxNxDw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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