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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8b70ad08f74c4d3938c26a45d6af0d50ee5d1cb80f91915c66ff3e0c3b6ce79e' 
  AND token = 'dBbvz47L0Dp7jgFU3cGSG9hx1JS7ISk3uCZdAoTNz2o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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