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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fe5575105a3df8160f6004aa4bc2f8caa5277f21e93048882b5436a29be345a0' 
  AND token = 'eylq7SP9S9KJfgYUYVtMM5pER3rd4M8AFvMP1rajx6o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00049

JSON explain

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