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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a03f2696e5b5bf5d100d5cf7ef8f10b174806f693d29190cc5121b980727e5d8' 
  AND token = 'rnxsrPCEYANepAtg5wChP4GgTp2bZBRKHk4U83ySR6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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