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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b0772b7ad7a4fe9f9537fbe91a9f9586ecaa471137556abd7a233c5e2de1efe7' 
  AND token = 'A8H+rFEeJl5YW1kK3NwHZDYy7PKQrg3LaH8TjTkrV8E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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