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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ee72d419a9e83af3391790917ab07150c93fb4e7af9a6f79f0f520a3822d7c26' 
  AND token = '7qCCT2IksO6Lsl9bpMNBlhCd3pkqbsICw+FATqXETzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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