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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d6bd2eb4a144a28a7595a2ada38d8157d816a88761df92a13fbc8d4f256e08b' 
  AND token = 'xy0s8J2A1MgJXU/vWePlk1vAqDQ2rS+JI0YxYRTM+yM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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