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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5feec1c3b91cf3fafdc15a61523ad62ee14945fba16377266f142f0a3b5601bb' 
  AND token = 'yqE1t+4fzShKd3YXw8sjIslqGZ6aw2yG/ufTZ09fLe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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