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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae91e39d6b3c6e9af4a13caaacc8a14628dac457f9bb986bc730740d07171630' 
  AND token = '/d6PCWqNL6vCGKqhxEuvCtYg8dAq3YheTkE8C2esEwc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00050

JSON explain

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