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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3dca1a9faa4c35b9e55f125f5772464b85a64db492231cf40e9476f3400b90d7' 
  AND token = '1zLmFAUt6KJV+yAnk1BuP/2FlPB193xX7EafPiDyC+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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