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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2afd1be85928cf933a8a7fbf15f5a578ea5176f38bde7f5277e4dc0cf1301ce7' 
  AND token = '6DxAu96THEPaNnCuy3HBnY9KdjVG6DDBi30aR4A+aAU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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