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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ca4ba330f8d3c1da0434d1b975f8e6dd449a801dffc41b27a2390afaa7e9b54' 
  AND token = 'MSE31w+Q7XYqatDqrSjbA5G18rY/betqxrhmT7A9H2g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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