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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e2b7dbf7223cc9645fb8b438e9de9c98da347ba9c06cbb6e970336b7b7f1bc9d' 
  AND token = 'x5K2ZVUjvMljSoxvbTdZ3wRTSjnbub2tIShJRwhhVaA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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