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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2338ddc21536b685dec6797692b0ec901dd51b9521d36377e2afcfcd13a21d70' 
  AND token = 'tceH4/2ISHs9Olcfi4YCWvw5QK2QlJttEd9b3cmiTQ4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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