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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add446dc5ca145f1ed60bbb8ca57a876049db0e1b803226271b45ddf3864ffdf' 
  AND token = 'hUbrRq/sVVMK2jBsFMdfdrnWlzkH/B/lh6oPX3CMrf8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00041

JSON explain

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