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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '84830f56cf019c31bfb6181858409e2c202540ac793ae8eb5dc513caca29ddaa' 
  AND token = 'UlgzVX28Be9pZxB7RS1CysOqvDESVzghTPocLlnUEP0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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