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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dd9a032b7d5262ae16109f7118d8be75560227e5628710d5709208e46fb82f1e' 
  AND token = 'Ca2QPHe6VnLPX1qVJWp6l7eGS+bLfJX6v220yRsictk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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