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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f3de69467ff5c316e106cec4e4addaea7389d6b3c6ae0803748f022f4c6e28a' 
  AND token = 'ZoKwB52FJj6PmIiyWx6t0VEYw0aeQnIkx6Y1niaMdNg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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