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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1638b29cb6b52c7e930189b9df39f1131d9ffba319894d47c0bfcc0acd1b4dd8' 
  AND token = 'noROiOnljQglYJ1WTbksYaM/kmJ7y1EOHwP5Pl44YTs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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