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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55c7ca0b73675ee6ab666675f04296110f4ab96aa78faa1a0238e3dd2ee8ade6' 
  AND token = 'DC+rz9+9qV11XZNw20AHr43LVIuG/6w/v4QSu62L5F0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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