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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd62b729a56b53f5a58ba6f62cad97ce70c4dd7a3422b42c73c656dd41eecfade' 
  AND token = 'kYl4v96nqAj02tm6Q6svCeImeg4LiDXUSfp2oN1hYoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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