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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62975af458816b3d6a49249ec402cbbfa978b0b4cd8a6b2f35454489fcd10212' 
  AND token = 'EFrYn9taan9JcAwk3xKR41+TXHA9A9izl3/jlDwnFJI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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