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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '560f22efce2b92bc20de03da15c9637143590fa5517f79ea82725d93dda162b7' 
  AND token = 'n85UbRyeby9fuSGL8LxHv/pEwbHpTuT6n1bEEmZ/c8A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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