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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b349e8f709e532066ffa357733d8e8eb6d2eb2f7e96433b7db506f056845de5d' 
  AND token = 'tVoQ8ygyDQhbPbph3/Mz8k+U/IAEOPZ7IAadZclQnOs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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