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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '814b2ee30f31ace5b7c0ee15fc8edbf3dfb7b98739e0834e4f1c4a13873a6e2b' 
  AND token = '08y7Y3GQLSd1BNGRmiXTzwRR6+6gBfd6mWf3StKqJ8Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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