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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89ea13ae9ae96d8bcf640a44df3d5a38514b1832e07640630c90cb18f430b1a5' 
  AND token = 'yH/GBOcKbNSYogPg7WVxoo4h2APCOgIfDiRoapys4KY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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