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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ba1c23e2cea773e7992f249a06bdf2c962730b0de470789c38293e558fed7932' 
  AND token = 'u6p+VqVF/ZZN9a04yklWr/ZRHCLcIU9WuTRCawzmYjs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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