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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cdad88c1b731661445d7a63520e8f50cca97dd422ddadcc95e8a3ba7c161b560' 
  AND token = 'v7ReE21bzApe5KlLuPB8umQPm9xKTgKZ5643JtEHR/U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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