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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9a12a4b66d3148ce4f2dff3f8d6cc6b3b8737c340aa476a741c744c0cfde51cd' 
  AND token = '1NmRxAZWXcIJ1bIsBDt3nIKtTJzDR6IFX+Z+j/g59lk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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