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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bdc7ab2b80c332622410e8f6b5a5ce2cac643ead1c7830f8f6beeae82799307c' 
  AND token = 'T94KKYQtaYyHUFXMqY2LgWLWEvJ1POJx97VgHaW3mzc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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