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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3613cdc72cca130b91563cbd0eea989bb274352b1c52fc42be7bd10f6d56a3fe' 
  AND token = 'xFXtFhnx+pPZRLlUR4DspZjeq/O3k2gTv+mPM59gobE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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