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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '661d7e88d8920fbc3bac40bc4c684e381cf5c3bd701f09eb3eaa758e5e4d2099' 
  AND token = 'vzZAqdlcdI52qkVAyELo/jBCsZDL7cnvYrH0cNtChmU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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