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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bd073a3246878b072b9d6744f8299ccce995550352f6ab493fca6bac510b5f72' 
  AND token = 'HbhiVqnfGWfTUTb9/NEiyXutHfnvHYUN1CA3TF7wIs8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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