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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddaa1aa40a3268df9b5a70f0d6cef61a54e0f684a496ad888cf459127bb68fb9' 
  AND token = 'gXHlbgZg5A/FztOhfNoI9xQl+M4gvCFYpEzARU4QV80=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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