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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fdb1308c0f43fdd44859a637632be46063a3be79b3daf564a6f5ebd1cb3ab88' 
  AND token = 'weYc77pwitpmq3RpqXdvHnezt1pf7HaGib6KyRKx3uo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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