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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c1f1087d87b1f68418446d54f00671e17c989d9036ad70a3fc06428b18eda2d6' 
  AND token = 'xFPRrx/Hlt00QyikI3SwGGFiUvHE+mc+b0efb8xT+NQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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