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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '11fe63d6dd9be64aa3b820e40552dc3e2ba1beee8d8e431853d4a969d6a65501' 
  AND token = 'W6A5XtEB1scB7fIl8QvDkcKIVMHNCaFFLdLJm276f5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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