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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '70a9e3b82a7deee69ede029bec9775a3fde4e8b65718a50da9337509269416df' 
  AND token = 'tBTr5VHbu81pKAXtdPOPefhF/R6GqQbnC5Nv1kphdSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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