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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fd8173f4e20ef82aae4dbdaad60eb92b9bfb811cc41f6af66b069840bf23b73' 
  AND token = 'vZiMU/PYPSdFcVNgsQ87HHyOrmlfKaYCg1C7lvkbX3c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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