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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5b884e18f12c2f1988515adbe6af7e8b5afcc1664b0fe79d7c51a14245ff218e' 
  AND token = '6/iGCUw22n1pNThppdkutXg736IXwd9+OryJZJ0ghu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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