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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b8315994f9fc7b5c2dcf5fbea5e8f45816d813fc9e6b24750db94473c86821c' 
  AND token = 'TELIDeDVrq4G+8a0BAZ3JRGxSAxF2E9cnoPZRPnkYzs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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