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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ce91d8ad09b29ef0822098d95275639a7a2b1f5d5068f9eb27d244c5f2e01592' 
  AND token = 'tnThYTBqmLvg4wGVQb9EMvVwGyUoc/ABUFe2Ddn8W9Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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