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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c0c2b21ad99f9ea6f2ff61b66f1790abd41eb62be7a1201b5c5c32c9907e13d' 
  AND token = '9xOLh8VyK5Gcbbfr8Dh82Tq8V6E25hkOmpje2a9iGyk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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