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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3912316fc9250f08ea6fe3cf289ccb8cf3550e74d31f12b7e0555d49a8fabb29' 
  AND token = 'fpQ61JWITj14jah2Te+mZnmYJNILq4XG2CD041P6Spw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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