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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '202bbdee03ca2d653e7cfee1a1fc2cb9be6fc19df68145c994769e2fdee54628' 
  AND token = 'u6z7fq6qb953TI1QLaEo9xJ5zL7GP203HIwBj1WqbmY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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