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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '41e66b092f42a594b5f66fe61064084f07ec1d40c2718575ff3c0bf18934ab7b' 
  AND token = 'BKIZv0+OXJ+Zog0tnHvsFM1RWJHJBSB82pM3MWe8FWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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