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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1bbec7bc97e079d676fe16473cb305ba00812fdde03967a766aebe04208a89b' 
  AND token = 'YxwRZG3KRH12kR5JEY9R80GV3hbu3ku0l6xCroRuDlw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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