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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dda6fe86cf2da453186cb5b9a8e77ff3dfb1743459f334fbcfa5a2622e1b77c8' 
  AND token = 'AdLYoPDyjEhS0//bNHnGCT/O0jOC8uF6VxorHPE3PGQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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