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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '077060cdd49f26c345b39410b7ed6b55d1f3429bab00c46c700e1ee3f23521a3' 
  AND token = 'EF2sg9gNiv6MpYr9V1hGat/meSMvrtSp85wDkQdN68E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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