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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f64a4ec798019632ba13aafe5cbf2ea42093ee378b063999973f0e1e105955e4' 
  AND token = '1QkCl8bFaU1Kz39K7im9z+pKZ4uvieh6zrZ1x4sMeFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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