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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd9cc587d3deee3df543e766b5b2a7d5893a6c0f381a5090ff32b8c05196a6f1c' 
  AND token = '9p7jQSh27np5efTNwZzxfUQ9D+IefoftvXb2JF8Nj2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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