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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'caa686d6c34bd42e8f9a4c6fe2b060a3b9aa1b96d7a6e525b7b5c34202c9a55f' 
  AND token = 'G+l1ar+V4tM5PdQjf0hQdHv+rCERYqtXiM05aaNUJxM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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