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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '30e6adf5a77526f80c9f5d657984484ceb7288ff92edd8119d6814013492bda4' 
  AND token = '4nz54WqGPIxSMRaWFrHvu+5V8TbqIVOKrrLyGKLi5QE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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