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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'be8f92e69e5539c2a9e630e0b020c87efd9dd5b9fa9c4422141fbffbeca0f1df' 
  AND token = 'OnVx9coR2JBkZyZT74d92uIyaytUoCKw6WgMK5xLUhI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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