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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13ab51a0e0c45f74157eaa8a9f16f1938642eef40f7291fbef1a43e8cc0c534e' 
  AND token = '8LjIDEF+zAhiHTlK0STtr0e2JpRX2iIV51B6l4/DNys=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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