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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1f7f1962af7413e6603fccea7f035a360f001406d0ae0dc6dce16d38566d1c2' 
  AND token = 'HjQnGOSTONfGX7jOut7t1yuOL1Ejw8oKf4ehGGps8kQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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