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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71a67a8cd0574be86af9b11ff65976bee49d0db53f8586c0954368c9773153cd' 
  AND token = '9uG9EZ99nhEV6ntyO7RRWjgtcAOD5lpmLHixRkG5MrE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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