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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '176d44cb304e67c8732ebd588d9d66b2a583c656a352517ae481b87493343c5c' 
  AND token = 'hu4JleTSEfLz5wimK76EYXRGlZnv3bixtVIIzf512yk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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