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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '300ca65318479df9563318dacd6c745db935b147146757406c6a3a8f37a49e21' 
  AND token = '8/xZsY+uL9pJYWv9ljLpa0Pc2TZiA1An00xOoppq2tw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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