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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f62486b6b9fe011887ec8db1b280f0cb90f4a6f01f3756805f38b02c34fb81b' 
  AND token = 'bYLSvlNuzvmZl1ENjoPAIBJNJwRDluIkhEj1PfhFGiM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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