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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '73a47556b9cf8f8c3bea72ca0d00ce8679e458ed4243895491e9a3328bb834e2' 
  AND token = 'zxUtVJRJbZHOJUXsiQTqez8AwIjyzUv8NffKRPPtImE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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