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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c5e3f3cce8f7cdc964f9d8c1ac30730991d566c1c1a55eef058725f18a9cb86' 
  AND token = 'Swufq0E3b4TZUOpbmxaoIiOU3V/h63L4UOyZaQDU3n0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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