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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9148dc15fe98f365a526fb0aa67f1589b2edc8829d3f67196ea3005deeaed02f' 
  AND token = 'IDm+yNkJni6aYR8k9acfn8wGT1oMm0ok9P/Z71KVgqw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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